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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db86bcf5beb52e9ee399440c70ffb43457882d326fd1922cde454033c6e2e89f' 
  AND token = 'yyggBveHEZAsNIkdI6tW1fTK9+j3Q81st+ty6DdOg7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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