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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63410d84fc292c3f5dd32e3e706ad3a94f2ac577db57f2660758d3acf33f327e' 
  AND token = 'WCki4ZOm4cbDbL63Ti4jqJLX6ONd1+TJopqqV47RgFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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