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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9609a3ab6178ffaa82a3f4287eab610a7fafc506c7f2ce5d7ad360247b269c7' 
  AND token = 'tms5JqsDcFHUTtx9T7rg9Im7KYwKT13QiKDfhPk6uQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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