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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce9f8848d199b1350a5f9b28fa2c279be249d2734cf7bcc0e8f3680e7fc0fff' 
  AND token = 'VGVFCue49HC+J14CCzWSZzMP+Zv85fH0TusRC6H687A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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