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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f94f6f0f9321cc9e6830f9ffe69b1e90d4708def5f65f030c13e01968743239' 
  AND token = '7+cyastq5FGfoYJt3NgeCHtVvoba9WsB3HoUFAW+bc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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