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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f6db6742fc6ae8526f7662c4511b336dd5d58a8f01425a5f314ed1404e5a34' 
  AND token = 'tKS4bz50LEap/ws8z1p2kJDS/ORKC5OTjJlkkhERq/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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