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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d13493fa4dc6a43feb3b44a53ddaed7fb7c69f7986ff412e421c2334ee83af3' 
  AND token = 'tTl8MS12tXggymeaJrX3oFZaH/Opjxi1glBn1+ps8II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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