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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03dda90c1abbcd12ec34f8edf904edb07944bb025d4f384f91ae23d8943089f' 
  AND token = 'WiWMT1kxtnXzu3clDbT3Bb8k2tSWedhm29HwAS6+Y3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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