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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39872e8f83a48eba45dcae70b68ce93fa206b3e95c6ca725821bc8c7c555bef' 
  AND token = '8PW/L6n5ZrZnfjGuFzf/EW4FQ492j0oLSkuIB/Nx2b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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