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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9769239daffbc809f7e238ad3790d28287781541e9fbc5763d33b6948e8aff90' 
  AND token = 'EuuWJALacIqYJwMATbb0CbjWDpRSW9HZz//cUz2Vnx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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