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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405c0118df70753563b377b5926a6b46f75432f07618ab7ae802e655afb9eb9b' 
  AND token = 'w8fIDOWlECKF6KUJZt3cbkPw3xZkLsMh+y3tymmNJm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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