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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eafebccfb7e3097ac8d8d05f7e615649dfca59d35d97bb5c8edc9e94fbe9765' 
  AND token = 'CwIS1f1fc48VtKnDqEi0QFpTsBzZiWO86Y+5j8SrTRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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