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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ebf55c535c3111e1125ba530e69b8db57ba7c2ed3bf56aed928d6e5fdcc21f' 
  AND token = 'FvnB3AhO5QHy50FCwV9yQWpOd08LI7zU1tjB20KRHbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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