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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2092213c3f59a5a395f014942d2923d80ddb962e0f914221ecf1d882768589e' 
  AND token = 'u99u+HJ0W5eeOj4ZeQNeNXsJRzfd1D7hifUCKo6e0As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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