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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833d630780f8313138c7342643c442b7f9db62861b822bebff5c0af0c41d298e' 
  AND token = 'pBNhKkDgYvse52M2ZU54Y9lWgZnfhDD388Sr9UOy6IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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