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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fa110f8d2a23afde34859a6f2fdbf44400a5b29b74bb53dd45cde723573952' 
  AND token = 'rq62Ga3/LS2aqLqT7elY8L57RS9HDxuyiFAZtjsGkl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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