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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f08dc1f507b9cd45124eea036322d74262e60b4211d6d527ee6d20e6a4a0ab' 
  AND token = 'pWyNjyHzFv8Tc60PHokUWq025HEUPNTR8AXGlGWOfUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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