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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd7ba404bd8c0aff448cca83913f5bd9ea24041b12179bee668586944cbd91b' 
  AND token = '8QURTe8MWKZuZw2XwGClSIL5x4wCRu5v6p7LqbV1Uns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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