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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd413255d9b950a28f108e75207bb0b45975a4407b0e187a48a52105d6b8b95da' 
  AND token = 'M2ib0euO3EJoCoH7DMf9hGdQLf2jGStvDBIhiMthmx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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