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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1329f583743e4c39cde64921709c2d8885de3473f27c38975d223e8c73aea74' 
  AND token = 'yh8ZV+qkezIQ24jyR5yYoGvI2T94oSAb8E1LUDOk+ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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