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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496d230d1c6a5f4971a6c2b2b5ae711575df72094bde52a65dc4775076f47504' 
  AND token = '09FrMW9PfUpbqnrkqUju4KPDA0BQRvSKMDtLOWwh+QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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