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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb528f665e5bae094f5b943da8bb3ca20379fa75ad30ddf0b59bfab43068418' 
  AND token = '9K0OkHhnu5clWFxolUOtIjy8gbE1YYVEW4p5fyLeiuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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