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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5fa298a0d4ba827b6e9bf8f19e5d1c5897eeee330484361eabd3de6eb87bea' 
  AND token = 'Pu/ZPpDanJQjkl99LUcIt2tG6Q1fglkkP61zf/AVsRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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