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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5996a030ddfcd3b9c5ed96b7d68ec4c8374b1e184519452a239acd166170f182' 
  AND token = 'E43FEvvpRsQbD3aaHxgzXu39fHf0+MppGI6MCEgxInY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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