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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46afeb20c7a504e5340c11be121f6231c4d1ab4183ddd76a7246e645c27403f1' 
  AND token = 'z7244832VrncyuoOFBi1n5sLdBUeAODOXuDgEk35bkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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