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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd348fdb530ced55c1ecda5fd21839504c0a8d094b9f4fbf4a3a23d78b2e80cc5' 
  AND token = 'fSGsk8wsjSIIEo5ssyPy1KXzalHAlUfMtpojrNW6nbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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