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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0047e5196175fcc3c7db0d152e2f8aa3db68545b0d277889d1afe493471eba' 
  AND token = '4NB9k0QA3TUhZpSrbhCZf46Gt6a44uzVlw2VV0N/xGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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