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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9052b0e7dc47899e99e3f111b3b133f02f684cee7008dd6071e81e42525535' 
  AND token = '9xgeuAsFI78ZoOdOlI4J0xo6KgfrtKLohJW7I6ap2RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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