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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad3c3a9ee3e6e473c9c504dfaa9c896c78e2722a5819892b0dfc8661a4114b7' 
  AND token = 'dn9xdlX/3vxZ7qC6JjJ0oyRSDyPE2bUs9DlIMo9c+Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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