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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf49f7d2985bedccbb9e1db59804f4b9c21808eb753d7af0ae263a087970a2e0' 
  AND token = 'nZNksBfS4DOIeM5cvnE8lkaVHXBa6OGE1ka777QL20U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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