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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa33eda7724ba7d250e3a440f35444bdbb4cb52842b8a313de2b26fdbf07c7e' 
  AND token = 'oseypjj1FQKAhP7walIYBBlozohySMOq1ZfMZNeOYVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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