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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612fbf441e91fb4d5f0c346545af981cff30b284cac3c3769f0e42a99e534465' 
  AND token = 'MgisF1JpeC2ybhUvunmUE9A5c/CLIqvUG01ONXMqyKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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