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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db91d95ea42f1282b1e465bf4acdae8c614044f61042ed8d0db525a990d8d85' 
  AND token = 'dX+YUaqK7yw4XGv0XNbQOcrLnVtIe8eTvn3F10DC2Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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