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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bed63c0bfc1b969c1bd2bd79fa388eaa40e7831f46f2cd953cdaacaa21ee4f3' 
  AND token = 't+hZpTs3QuDFvnNCL8JXKU1bqfWgMQE++FveQYtFoAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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