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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0980413979beb0e64d7805ba5bf0ca34ae6cebdf5f9afa62f87dc1c3c091c9' 
  AND token = 'BVF53GoXY3EGTozaSqUzVPKTRwsjanvKYfjB6BNfSio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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