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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb679927bfd2c939eb60280054acb7d6d4e852aeabbec2f65d6525987452d48' 
  AND token = 'X8XiFkYZ6MH53STiQndHIkD7DBHbnEux2XK0SSbv0G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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