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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153cc86bd234cc991eb10cdd57ca66fc63ff95b332a726e6f82602c5988c2a77' 
  AND token = 'vh34XRrsMyMwI+O4qJrBErgBsyNycI0tnhWXyBKfMQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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