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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacf032f800ccb310052f104589988d035b3be48256ae7a1527ce3dd22b6e4ec' 
  AND token = 'iE1qRdqQuLYbsaP40jb96u+dKzlbFnSMKrWisp91/kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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