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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4beb1dfefbbfe8c53b203d496f177e8ad2c1f8b919ea8dfa2ffbf69ab8be4d7' 
  AND token = 'Hm5ZlliGijSUnCSwU5dgfRxy+zTai0BA00mDMyyj3bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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