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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff764b9bbcc3b35b93f2085d0c0b2d33a2cdb8f94afbbf3a7666a0b2b22e75fe' 
  AND token = 'LFk7YM6z+CxUwc95yCbTIg6wtJMOJAbswXi2DkqDht8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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