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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058824576f01841c20ffdeab389cba8b85f3665b86103e3968f75106cf243dfa' 
  AND token = '3d0Ii+fb/MySiS1LM/Y8LMhJV47E/Ol98asCJ1Q6rA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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