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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13f1e9a2f462d598007729a27c92e0e3c62e84ab0002d1b29969db0ad553987' 
  AND token = 'GmijJVm7rE0ksowUrZ/9pLpPLltg8OEo8mZ+M3yX7yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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