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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf055a1e907a978ced78c6e4392bb91b090ab90cec09af6d35cfe5c493c29d9' 
  AND token = 'vD9rIkFWEm8+0QaYsr9TOMO0XqRt2idjI2Ddhk2a9H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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