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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096152350aced680806afa85966c1a8c39e3579e278e1b4b19c62858c41623bd' 
  AND token = 'kq7CcJMTOuLoJW0CAa/LlPgj7yYuCU0ftr5x4NG4/08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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