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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d1e5705c6b5f43ae4b04cc41a7535cad88aa2c350960cc444964c2db74a78b' 
  AND token = 'hglfl7GSMe4gFqjpUXG/vHCRGf2Q3/f7kX7g1yQoDow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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