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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2092467a40a2d3598a1d5f4e07e5f78f62b743ff93fe7a417723992de2420b' 
  AND token = 't0XDZZ9ccg798Ge4ElPJ+rodmrvTkH7j+9CnZv1Y5o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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