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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa3418c803735c15b23466d99ea48cba2741a1e13119d3d5ff6ed3cd1efb87c' 
  AND token = 'clAOmeviukryP+Ed//xK5vCGMIDkDQhWv/9qKrK3smg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}