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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4704038c9f9fe18827b5dbc94a17f9d6cb3ea7e0e1d45c2c06fd9f846f95c22' 
  AND token = '+9YNE1gQHHeEslfp65Anc0RG8xIl/gg82YROXq7VLcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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