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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068ca1cb21d4c71473fee9de8e8087c0bae71b0fd0338924bc0cfcd6b4b9b7ba' 
  AND token = 'APde4Mh20SK/2TG/62eU0Anki6vaaCnYmeYtFRluNsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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