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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3063a28a544a9d9aaea1bc64485c95012601ac2605b0874d1f8dd3bf662b36' 
  AND token = '4Od7RVDQq6hYzfT5ny04ULw702vJ2siPA0FYCPq489Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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