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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa298f11691d36af8d92f89e6ba9d73a6b0f59b391ddd0f1f54a27fd1ed074b' 
  AND token = 'rXTebY7Y1xfd1vgYqW67yAjuyBDK2ECFaZDdgxhhrFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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