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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8e02d53b5ceffbdcb2450af9ce0827e5b3673f0f6607ce7fcb2ebc64c7c126' 
  AND token = 'g4fYUxU3iWVwRzAfnvdePMJbFYtRmSTkqd/MQiHfLLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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