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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b691c173e7a7e03c4dd916007004477e2a4bbc10f02401cc6e94bae3c6d42e8' 
  AND token = 'dfIr6SzSJQ+3W2U/B21Kzr3CVWfpjgRzl8z33Szuw7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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