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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc21294d37e00198001c52a3acdc6a748f01e77d38db56cfc6f42000e39c9839' 
  AND token = 'BNucAo80PyLC8gV8Nj6roe+5l6pKb05iUULI4P9dOcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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