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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6ed02d107cfdba6ad3f65b1e9b8dfcba6bdd02a819aa6759cbdd805498679c' 
  AND token = 'QlmDvSF5IB8dPWo7jiVHFwX47QQpS6QDQpyjULcQayE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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