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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85f6970da60a31b2ef80e89e7d81663293384e69a4b71a5acd12a17d25c1cfa' 
  AND token = 'sv2Qah8rSMxtjzQAEL3ffdHna6/zO6uI6WCYZ1/1jWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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