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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7ff150afdb9733244f515a67308b52414fb90fb360db559f129a71928aef1e' 
  AND token = 'VHNacp+SVk59eVuC6DlH3pCV5NTZS3BOWBOa3K2rbtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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