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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a420f9cbf8d68d703bfdbdfdb6ec92fbc614e0bf95d79a227f7fee66024af2' 
  AND token = 'ny6zEGdPLX6zXOjRYjt8SItKtDar1HQuwXd/jgsuS84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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