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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66eaf0a2343d6d07bfcf1136d04146cea32e12c601b8381289b4f98501975f01' 
  AND token = 'FcZlIoIexUu8TGeTc6i4omw6TEun3N6y3byy9EVmDz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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