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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69263579feac889e91ab9c6558ef9301006e19fd3560fba84224a9874218ed0' 
  AND token = 'IatjSMZHoRw2Whd68fv16mh9uz4Wmg6YspjYLjm7+rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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