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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52235578cc431e67ac4d4cdf521c8fc6b3678e88d590a407f7da1b75fb5b4bb' 
  AND token = 'INqkAMz5PNqSefMvJKBvH7iR2WpOtlXUC/oEWzX3vyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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