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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aae1728aaa6e65e2703c4bc7bcb9bb723eac7086b1c45cc09126d3d5c2515ca' 
  AND token = 'R2NSt5sY8ffeCCouX0fotspNv9cusXgqyIO4MycFsrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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