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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c698fc6313a79f703c31815723b8afc27c797c5225fe49d22750cd558d8e42' 
  AND token = 'zP/Kv9QqN3y7Y3AnkySDkxyESXo4cF71Yupuyj9as9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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