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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d75f3dfee4008c2ab95457322e92f608d8b0dfcbf19e2114e39fab1fd10b23' 
  AND token = 'VRUBTiUNM6nOqApiZYMQgyupALI1l2adzp6y7qy4NTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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